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A push-pull olefin is a type of olefin characterized by an electron-withdrawing substituent on one side of the double bond and an electron-donating substituent on the other side. This makes the pi bond very polarized. The rotational barrier for a push-pull olefin is lower than that of an ordinary olefin and this makes it an interesting candidate for a molecular switch for instance azobenzenes. A push-pull configuration also helps to stabilize double bond because the carbon carbon bond has considerable less double bond character. For instance cyclobutadiene is a very unstable molecule but with both olefinic bonds in push-pull configuration (two ester substituents and two tertiary amine substituents) the molecule is stable indeed.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Push-pull_olefin". A list of authors is available in Wikipedia.|